Fungus Gnat

Life Cycle

Color: Usually dark gray or black
Size: Small; commonly a few millimeters
Key Markings: Slender body and long legs
Activity: Weak flight near plants
Common Areas: Damp potting mix and growing media

Description

Family Sciaridae

Fungus gnats are small flies often noticed near indoor plants. Larvae live in moist growing media, feeding on fungi and organic material; some can injure roots. Development includes egg, larva, pupa, and adult. Adults usually stay near the conditions that support their young.

Flies develop through egg, larva, pupa, and adult stages. Removing adult flies does not remove the material supporting their young.

What Attracts Them?

Consistently damp potting mix
Fungal growth and organic matter
Poorly drained plant containers

How Do They Get Inside?

Infested plants or growing media
Open windows and doors
Movement between nearby pots

Signs of an Infestation

Small flies around pots

Adults near nearby windows

Larvae in damp growing media

Activity after watering

How Serious or Harmful Are They?

Adults are mainly a nuisance. Larval feeding can affect susceptible plants. Persistent wet growing media allows the problem to continue.

Treatment / How to Get Rid of Them

What You Can Do

Adjust watering to the plant’s needs
Improve drainage and remove standing water
Remove decaying plant debris
Monitor suspect pots and avoid spreading infested media

How Pest Guys Helps

The A-C-T Process: Assess. Communicate. Treat.

Assess — We inspect your property, identify pests and activity, locate nesting and hiding areas, and find contributing conditions.

Communicate — We explain our findings, discuss the recommended plan, answer your questions, and confirm understanding and agreement.

Treat — We put the agreed plan into action, perform the initial treatment, provide ongoing service, and monitor results to adjust as needed.

Frequently Asked Questions

What should I look for first?

Slender body and long legs. Small flies around pots. A clear photograph and the location of activity can help with identification.

What conditions should I check?

Start with consistently damp potting mix. Adjust watering to the plant’s needs.

Does seeing one mean there is an infestation?

A single sighting does not establish the extent of a problem. Repeated activity, developing young, nests, or other evidence help us determine what is happening.

How does Pest Guys decide what to do?

We use A-C-T: Assess, Communicate, Treat. The pest, its location, and the conditions at your home guide the recommendation. We explain the plan and any preparation needed before service.